NOTES TO THE CONSOLIDATED ANNUAL FINANCIAL STATEMENTS l NOTE 9
    2013
Rm
  2012
Rm
 
9. Vehicles for hire          
  Cost 3 130     2 995  
  Accumulated depreciation and impairment 665     674  
    2 465     2 321  
  Net book value at beginning of year 2 321     2 057  
  Net (disposal) acquisition of subsidiaries and businesses (35)     50  
  Additions 2 662     2 472  
  Proceeds on disposal (1 746)     (1 615)  
  Depreciation (673)     (646)  
  (Loss) profit on disposal (7)     3  
  Reclassification to assets classified as held for sale (54)        
  Reclassifications (3)        
  Net book value at end of year 2 465     2 321  
  Depreciation is calculated on a straight-line basis to write off the cost of each component of the vehicle to its residual value over its estimated useful life between 2 to 5 years.

Certain vehicles for hire have been encumbered as security for interest-bearing borrowings amounting to R48 million (2012: R69 million), (refer to note 23).